This bulletin applies to 2005 and later Porsche Cayenne, Boxster, Panamera and 911 vehicles, regarding water pump replacement.
According to Porsche, most of the coolant pumps returned to Porsche under warranty with the damage category “leaking” were indeed found to have traces of coolant residue, but a subsequent function test has shown that almost all of the pumps were actually fully functional and were not leaking.
The presence of slight traces of coolant residue on the coolant pump housing is not an indication of pump leakage and does not require a pump replacement. If there are slight traces of coolant residue on the pump housing, but the residue is dry and there are no apparent drops, there are no technical grounds for replacing the pump. If there are significant traces of coolant residue and the residue is moist and drops of coolant have formed, then the pump needs to be replaced.
Information for Technical Service Bulletins comes from ProDemand, Mitchell 1's auto repair information software for domestic and import vehicles. Headquartered in San Diego, Mitchell 1 has provided quality repair information solutions to the automotive industry since 1918.
Mike Mavrigian has written thousands of automotive technical magazine articles involving a variety ofspecialties, from engine building to wheel alignment, and has authored more than a dozen books that crisscross the automotive spectrum. Mike operates Birchwood Automotive, an Ohio shop that builds custom engines and performs vintage vehicle restorations. The shop also features a professional photo studio to document projects and to create images for articles and books.
